Printing-telegraph.



No. 843,508. PATENTED FEB. 5, 1907. J. D. WHITE.

PRINTING TELEGRAPH. APPLIOATION FILED JULYB, 1906.

2 SHEETS-SHEET 1.

INVE/VTUR JAMES DUNDAS WHITE A TTOR/VE VS Ilfl null)": Pitta: 60.,WAININOTON, n4 cv N0. 843,508. PATBNTED FEB. 5, 1907.

. I. 1). WHITE.

PRINTING TELEGRAPH. APPLIOAT'IOK rum) JULY a, 1006.

2 SHEETS-SHEET 2.

WITNESS 'S V INVENTOH JAMEs DUNDAS WHITE M i 4 ATTORNEYS rut Iomu:Flu-Ir: cm. wAanmamu. IL c.

UNITED STATES JAMES DUNDAS WHITE,

OF LONDON, ENGLAND.

PRINTING-TELEGRAPH.

Specification of Letters Patent.

Patented Feb. 5, 1907.

Application filed July 8, 1906. Serial No. 824,599.

To all whom it may concern.-

Be it known that I, JAMEs DUNDAS VVHITE, a British subject, residing at50 Clan ricarde Gardens, London, England, have invented new and usefulIm' rovements in Printing-Telegraphs, of whic the following is aspecification.

My invention relates to printing-telegraphs; and the object of myinvention is to provide what may be called a compound selective relayfor use in connection with a printing-tele aph apparatus like thatdescribed in t e specification of my United States Patent N 0. 767,322,dated August 9, 1904, so that the various local circuits which controlthe mechanism may be operated by a main circuit in such a way thatmessages transmitted along that main circuit from an ordinary Morse orsimilar transmitter may be printed automatically in the propercharacters at the receiving end.

I I attain the objects of my invention by means of the mechanism andelectromechanism illustrated diagrammatically in the accompanyingdrawings, in which Figure 1 is a diagrammatic side elevation of theapparatus as a whole, showing the compoun with the printingtele aph; andFigs. 2, 3, and 4 are details of mo cations In the drawings, 1 is theaxle, on which is set the type-wheel 2, which has thirty-two type-faces3 3 3. On another axle 4 IS the r0 1 5, from which is gradually unwoundthe paper fillet 6. Between the fillet and the typewheel is interposedthe printing-ribbon 7, while below the fillet and opposite the lowesttype-face is the impact pro'ection 8 (which also acts as a counterpoiselon one end of the lever 9, which is ivoted at 10, and on the other armof whic is the armature 11, opposite which is the electromagnet 12- inthe circuit 13, the arrangement being that as often as that circuit isclosed the electromagnet 12 attracts the armature 11, thus movingthelever 9 and causing the rojection 8 to strike the fillet 6 and the ribon 7 against the type-face which is then opposite it, thus printing onthe fillet the character which is on that type-face. When the circuit 13is opened, the lever 9 from the weight of the projection 8 reverts tothe normal position, as shown, and is kept from going too far by thestop 14. On the level 9 is also the rigid and downwardly-projecting arm15, of which the lower end is pivoted at selective relay in conjunction1.6 to the conncctingu'od 17, of which the other end is pivoted at 18 tothe lower end of another lever 19, which is ivoted at 20 and has at 21on its upper end t e pawl 22, which rests above the platen 23, thefillet 6 being between them. Both the pawl and the platen have teethfacing, as shown in the drawings, so that the fillet is moved forward asoften as the awl is moved forward in the direction towarc which theteeth point, but is not moved when the pawl is moved backward. Thegeneral arrangement is such that the pawl is moved backward when thelever 9 is moved so as to effect printing and is moved forward by thereturn of that level to the normal position, so that the paper isintermittently fed forward between the printing strokes.

The fittings thus far described are of a wellknown t e. I make no claimas regards them, an I describe them only to illustrate the relation withthe other parts of a printing-tele 'raph of my improvements in the meansfbr rotating the axle on which is the type-wheel or t e-c linder.

Round the ax e 1 is led with several turns the line 24, which is at onepoint attached to the axle, so that when the line is drawnone way theaxle is caused to rotate in one direction and when the line is drawn theother way the axle is caused to rotate in the other direction. The line24 is inelastic; but one end of it is attached to the extensible spring25, of which the other end is made fast at 26, the object of thisarrangement being to cause the axle and disk to revolve back again whenthe contrary tension, presently to be described, is relaxed. That contrais attached to the axis of pulley 27, around which is led the line 28,of which one end is attached to the lever 29, which is pivoted at 30,and the other end to the axis of pulley31, around which is led the line32, of which one end is attached to the lever 33, which is pivoted at34, and the other end to the axis of pulley 35, around which is led theline 36, of which one end is attached to the lever 37, which is pivotedat 38, and the other end to the axis of pulley 39, around which is ledthe line 40, of which one end is attached to the lever 41, which isivoted at 42, and the other end to the mit dle of lever 43, which ispivoted at 44. These five levers are constructcd also as armatures, andopposite them, respectively, are the electromagnet 45 tension iseffected thus: The other end of t e line 24 in the circuit 46, theelectromagnet 47 in the venient order to the various single andcomcircuit 48, the electromagnet 49 in the circuit 50, the electromagnet51 in the circuit 52, and the electromagnet 53 in the circuit 54 Asoften as any one of these five circuits is closed the electromagnetin itattracts the corresponding armat tire-lever, and thus draws up the lineattached to it, and so, though not to the same extent, any lines belowthat one. The other lines, like the line 24, are inelastic, and therange of movement of the several levers is restricted by stops, one stopabove and one step below each lever, the stops to the five levers,respectively, bem numbered in the drawings 55 and 56, 57 and 58, 59 and60, 61 and 62, and 63 and 64. The stops are so placed and the lines sofastened to the levers that the separate movement of either of thelevers 29, 33, 37, or 41 draws up the corresponding line (28, 32, 36,0140, as the case may be) to the same extent, while the movement of thelever 43 draws up the line to half the extent to which the movement ofthe lever 41 draws it up, since the line 40 connects with lever 43 onlyhalf as far from the center 44 as it is from the center 42 of lever 41.From this arrangement it will be seen that these levers when operated,-in regular succession drawout the line 24, and so rotate the axle 1and the type-disk 2 in successive ratios which are in geometricalprogression. The various parts are so proportioned that the movement ofthe lever 29 rotates the typedisk a distance of sixteen type-faces, themovement of the lever 33 rotates it the distance of eight, that of thelever. 37 the distance of four, that of the lever 41 the dis tance oftwo, and that of the lever 43 the distance ofjne Internrediate movementsand the movements between the sixteen-distance movement and the completecircle are effected by the combined movements of various combinations oflevers. 7 Thus, for instance, the combined movements of the levers 43and 41 rotate the type-disk by the distance of three type-faces and thecombined movements of the lovers 37, 33, and 29 rotate it by thedistance of twenty-eight. These various movements are effected by theclosing of the various circuits either singly or in variouscombinations, and as soon as the circuits are opened again the levers,lines, and pulleys descend a am to the normal, the line 24 is relaxed,and the spring 25 causes the axle and type -disk to revert to the normalposition, the tension of the inextensible lines preventing them fromcoming too far back. The arrangement is such that when they are in thenormal position the impact projection 8 has opposrtejt the type-facewhich corresponds to spacing. That typeface may be so fashioned as tomake a very insignificant mark Wl18Il printed from, and the other tye-faces have on them various characters w rich are all located in someconterminal 73, from whic bined movements. These movements are operatedby the opening and closing, singly and in various combinations, of thecircuits which control the movements of the levers, lines, and pulleys,and thus it will be seen that the rcquircd letter is brought intoprinting position by the closing of the corresponding circuit orcombination of circuits, while the printing is effected by the closingof the printing-circuit 13, and that when the circuits are opened againthe various parts rcvert to the normal position.

The parts described thus is r resc i zblc those described in my patentspecification of the United States already mentioned.

I shall now describe the electromechanical apparatus (which I havecalled a compound selective relay) by which the circuits 54,52, 50, 48,and 46 and the printing-circuit 13 are controlled by means of impulsessent along the main circuit 65. That main circuit is differentiated intofive branches which respectivel control the fivelocal circuits whichoperate t 1e type-wheel, the arrangement being such that owing toresistances and cut-outs successive im ulses sent along the main circuitoperate t ese local circuits successively, the intermission fromimpulses after each series of impulses (which may vary from one to five)closes the circuit 13 and operates printing, and the completion of theprinting movements causes a momenta closing of another circuit whichrestores al the branches and local circuits to their normal conditionready for the next series of impulses. I shall now describe thearrangement showing how the main circuit operates the local circuits,assuming that at the outset these are in the normal condition.

The main circuit 65 has five alternative branches 66, 67, 68, 69, and70, (shown by heavy lines and which respectively control the localcircuits 54, 52, 50, 48, and 46 by means of the electromechanism now tobe described.) In each case this is of the same general character exceptthat in the last of the series it may be simplified, as described,.andthe description of the first applies generally to the others also. Ishall now describe that arrangement with reference in the first instanceto the first branch circuit 66, which controls the local circuit 54.

In the branch circuit 66 and pivoted at 71 is the soft-iron strip 72,forming an armatureswitch which normall presses against the h the branchcircuit 66 is continued around the electromagnet 74, which is of such acharacter as to attract the strip whichever we. the current is flowing,and thence around t e electromagnets 75 and 76, between which is theupper arm of the magnetized-steel armature 77, which is pivoted at 78,the armature 77 being so magnetized and the electromagnets 75 and 76being so arranged and wound as to form a olarized relay. Normally the uper end of t is armature 77 is between tliese electromagnets, while thelower end is between the electromagnets 79 and 80 and just clear of theterminals 81 and 82. The arrangement is such that a flow of currentthrough the branch circuit 66 in one direction (which I shall call a"positive impulse) deflects the armature 77 so as to bring its lower endinto contact with the terminal 82, and a flow of current through thebranch circuit 66 in the opposite direction (which I shall call anegative impulse) deflects the armature 77 so that its lower end isbrought into contact with the terninal 81.

In the local circuit 54 is the terminal 83, against which normally reststhe soft-iron strip 84, pivoted at 85; also the battery 86, theelectromagnet 87, and the armature 77. From there that local circuit hastwo alternative courses. The longer course is through the terminal 82and includes the electromagnet 80 and the electromagnet 53. The shortercourse, which is marked 88, includes the contact 81 and theelectromagnet 79, but not the electromagnet 53. Both courses unite againat the terminal 83, and the parts from that terminal to the armature 77(both inclusive) are common to both courses. This general arrangement issuch that if a positive impulse sentalong the main circuit passes alongthe branch 66 the armature 77 is deflected so that its lower end comesinto contact with the terniinal 82, and the local circuit 54 is closedthrough its longer course, so that the electromagnet 53 is energized andthe type-wheel is rotated proportionally, and if a negative impulse sentalong the main circuit 65 passes along the branch 66 the armature 77 isdeflected so that its lower end conies against the terrrinal 81, and thelocal circuit is closed through its shorter course 88, and neither theelectromagnet 53 nor the type-wheel is afl'ected. The electromagnets 79and 80 are so arranged that when an impulse through the branch 66deflects the armature 77 against either terminal the consequent closingof the local circuit and energizing of the corresponding electromagnet(79 or 80) keeps the local circuit closed by kee ing the armatureagainst the terminal even a ter the branch circuit 66 has been opened.The arrangement is such that even a momentary impulse through the branch66 effects these movements. The branch 66, as soon as the impulseceases, is opened in the following way: Normally, the weight of thestrip 72 keeps that strip resting against the terminal 73, and thateffect is increased when, owing to the current flowing through thebranch 66, the electrom a-gnet 74 attracts the strip. This doubleinfluence is sufficient to neutralize the influence of the electromagnet87 in the local'circuit, which when the local circuit is closed tends toattract the strip 72 in the opposite direction;

but when the current ceases to flow through the branch 66 and the localcircuit is closed the electromagnet 74 ceasesto operate, and

the elcctromagnet 87 draws the strip 72 from the terminal 73, thusopening the branch circuit at that point and keeping it open there aslong as the local circuit remains closed and forms a shunt of the mainline past the first branch circuit to the second branch circuit, ashereinafter described.

The above description is typical of the Way in which the other branchcircuits operate the corresponding circuits, and the general result ofthe system may now be described.

If when all parts are in the normal condi tion a positive impulse issent alon the main circuit 65, it passes along the brane 66, closing theloca circuit 54 through its longer course, and so rotating thetype-wheel proportionally. If a negative impulse is sent along the maincircuit, it passes through the branch 66, closing the local circuit 54through its shorter course 88 and not rotating the type-wheel, and onthe cessation of the impulse (whether positive or negative) the firstbranch circuit 66 is opened at 73 and is kept open there as long as thelocal circuit 54 remains closed. If with the branch circuit 66 thus openanother impulse is sent along the main circuit 65, it will pass throu hthe branch 67 with corresponding effect. af positive, it will close thelocal circuit 52 through the longer course and rotate the type-wheelproportionally. If negative, it wi 1 close that local circuit throughits shorter course 89 and will not operate the typewheel, and on thecessation of the impulse (whether positive or-ne ative) the secondbranch 67 will be opened at 90 and will be kept open there as long asthe local circuit 52 remains closed. If with the branches 66 and 67 thusopen another im ulse is sent along the main circuit 65, it wi I passthrough the branch 68 with corres onding effect. If positive, it willclose the local circuit 50 through its longer course and rotate thetypewheel roportionally. If negative, it will close t at local circuitthrou h its shorter course 91 and will not operate t e type-wheel, andon the cessation of the impulse (whether positive or negative) the thirdbranch 68 will be opened at 92 and will be kept open there as long asthe local circuit 50 remains closed. It with the branches 66, 67, and 68thus open another impulse is sent along the main circuit 65, it willpass through the fourth branch 69 with corres onding efiect. Ifpositive, it will close tlie local circuit/18 through its longer courseand rotate the type wheel proportionally. If negative, it will closethat local circuit through its shorter course 93 and will not operatethe ty ewhccl, and on the cessation of the impu so (whether positive ornegative) the fourth branch 69 will be opener? at 94 and will be keptopen there as long as the local circuit 48 remains closed. If with thebranches 66, 67, 68, and 69 thus open another impulse is sent alongthemain circuit 65, it will pass through the fifth branch 70 withcorresponding effect. If positive, it will close the local circuit 46 imagnet 107 to attract the strip 108, and in through its longer courseand rotate the typewheel proportionally. If negative, it will close thatlocal circuit through its shorter part 95 and will not operate thetype-wheel. This being the last of the series, there is no need for theparts designed to open the branch of the main circuit. The shortercourse 95 (with the electromagnet and terminal in it) is superfluous inthis last-mentioned case, though it may be used in a vanation presentlyto be described.

To secure the result that the successive impulses of a series shall passthrough the branch circuits in regular succession, as described, it isnecessary to prevent an impulse along the main circuit from passingalong any of the branches 67, 68, 69, or so long as any higher branch isclosed, and for this purpose the resistances Q6, 97, 98, and 99 areinserted, as shown. In order to lessen the obstruction which theseresistances would of fer after the branches opposite them are '0 en, thecircuit has below each resistance t is terminals 100, 101, 102, and 103,respectively, which operate as contact-stops to the strips 72, 104, 105,and 106, ms ectively, so that in each case when the branc is open thenext flow of current instead of passing through the resistance may passthrough the strip and the terminal, which forms a shunt of the main linepast the first branch circuit to the second and from the second to thethird, according to the position of the armature-switches.

As already'stated, in each series of impulses the rotary effects on thetype-wheel are cumulative, and the rinting movement is effected by thelonger intermission of impulses after each series of impulses, (whichmay vary from one to five,) the intermission between the successivemovements (if more than one) in each series being so short that theprinting electromechanism has not time to operate till the longerintermission takes place at the end of the series.

The way in which the rotation of the typewheel is followed by theprinting movement may now be described. In the main circuit 65 abovewhege it branches is inserted the electromagnet 107, opposite which andworking as an armature attracted by that magnet, whether energized bypositive or by negative impulses, is the soft-iron strip 108, pivoted at109 and opposite which is another soft-iron strip 110, pivoted at 111.These strips operate as terminals for the printing- 1 circuit 13, inwhich is the battery 112. Normally these strips hang just clear of oneanother; but when the strip 108 after being attracted to theelectromagnet 107 has time to swing back far enough it comes temporarilyinto contact with the strip 110. Every impulse, whether positive ornegative, sent along the main circuit 65 causes the electroeac 1 seriesthe impulses follow one another so rapidly that the stri 108 has nottime to swing back as far as t e strip 110; but at the close of eachseries (which, as described, may vary from one to five impulses) thelonger intermission gives time for the strip 108 to swing back as far asthe strip 110, and the coming into contact of these strips closes theprintingcircuit 13. energizes the electromagnet 12, and thus effectsprinting, the parts which effect the printin and the spacing returningto the norma position when the strips revert to the normal.

After each printing stroke the closing of the branches 66, 67, 68, 69,and 70 and the opening of the local circuits 54, 52, 50, 48, and 46 (soas to restore all parts to the normal ready for the next series ofimpulses) are effected thus: Opposite the pivoted strips 84, 113, 114,115, and 116 (which are arts of the five local circuits, respectively anwhich normally com lete these circuits by being in contact with t eterminals 83, 117, 118, 119, and 120, respectively) are theelectromagnets 121, 122, 123, 124, and 125, all in the circuit 126. Asoften as this circuit is closed these electromagnets draw the stri saway from the terminals, thus opening al the local cir cuits at thesepoints and letting the parts both of the local circuits and the branchesreturn to the normal, and on the opening'of the circuit 126 these stripsalso revert to their terminals, so that the whole system is ready forthe next series of impulses. The operations 'ust described are of coursesuperfluous in t e case of an branch and local circuit not affected bytlie preceding series of impulses.

The circuit 126 is completed through the battery 112, (which operatesit, as well as the circuit 13, the arts from 127 to 128 being common tobotii circuits,) the terminal 129, the strip 130, pivoted at 131, andthe resistance 132. The end of the strip 130 rcsts'on the end of thelever 9, so that normally it is just clear of the terminal 129, but thatwhen that end of the lever descends with the printing stroke the strip130 comes into contact with the terminal 129 and so closes the circuit126 until the last part of the return movement of the lever 9 lifts itclear of the terminal again. The resistance 132 in the circuit 126causes the current from the battery 112 to pass along the circuit 13 inpreference to the circuit 126 when both these circuits are closed; butas soon as the circuit 13 is opened the current flows through thecircuit 126 till that circuit is also opened,which takes place at thelast part of the return movement of the lever 9 after the printingstroke. Thus after each printing movement the circuit 126 is closed andopened again,

thus causing the various parts of the branches and the local circuits torevert to the normal ready for the next series of impulses. it will thusbe seen that the series of impulses (varying from one to five and ofvariable polarity) are used to regulate the rotation of the type-wheel,that the llltOIlDlSSlOl'lS at the end of each series ell'ect printing,and that the return movement after that causes the various parts torevert to the normal ready for the next impulse.

The characters may be allotted to the various series of impulses in anyconvenient Way. As a ne ative nnpulse does not rotate the type-whee Iprefer to allot the single negative impulse to spacing, and as c is themost commonly-used letter in the alphabet I prefer to allot the singlepositive im- 5 For the other characters 1 prefer to approximate thecombinations to the combinations of the Morse code, making posi- 1 pulseto it.

tive and negative impulses correspond to dots and dashes. It will beobserved that the negative impulses (except the first, which when usedalone operates spacing) are ineffective except to close thecorresponding local circuit and to open the corresponding branch, so asto cause the next impulse to go a through the next branch and to operatethe next local circuit. Consequently a ne ative impulse at the close ofa series is superiiuous, and each series should end with a positiveimpulse. To this extent it is necessary to modify the Morse or otherselected code.

I have described the type-Wheel as having thirty-two sides, and as beinoperated by a fivefold series of magnets, Ievers, circuits, and otherfittings; but I do not limit my invention to these particular numbers,and they may be varied. It may be observed that a type-wheel havingsixty-four sides may be operated by the insertion in the system described of a further pulley, line, lever, and electromagnet, thus makinga sixfold in lace of a fivefold series.

6 operated without increasing the number of branches and local circuitsby utilizing the shorter course 95 of the local circuit 46 to operateits magnet. In that case the negative impulse will be eflective torotate the type- Wheel if it comes fifth in a series of five. In thisvariation the six local circuits which control the six levers whichgovern the rotation of the type-wheel rotate that type-wheel in theratios of one, two, four, eight, sixteen, and thirty-two, respectively.

I shall now describe several variations in the mode by which the branchcircuits may control the local circuits, taking in each case the firstbranch and the first local circuit as Such a series may 1 l troniagnets75 and 76 in Fig. l are eliminated, and the branch 66 operates thearmature 77 by being suitably wound around the electromagnots 79 and 80,which electromagnets are then both in the circuit 54 and in the circuit66, these two circuits, however, being quite separate from one another.

Fig. 3 shows a variation in which the electromagnets 75 and 76 in Fig; 1are eliminated,

l and the branch 66 operates the armature 77 by passing through a coilof wire 133, as in a 1 galvanoineter.

I Fig. 4 shows a variation suitable for wireloss telegraphy, in whichthe variations of impulse difl'er, not in direction, but in length,

long and short taking the place of positive y and negative. To meet thiscase, there are I inserted in the branch 66 two electromagnets l 134 and135. The electromagnet 134 has'op posite it the upper end of thesoft-iron armaturo 77, pivoted at 78, so that when the electroinagnct134 attracts it the lower end is brought into contact with the terminal81 in the shorter course 88 of the circuit 54, which 3 includes theelectromagnet 79. The electro- 4 magnet 135 has opposite it thesoft-iron armal ture 136, pivoted at 137, the end of which 1 norm allyrests on the stop 138,"and the move- 1 ments of which are retarded byits being connected by the line 139 to the loosely-fitted piston 140,working in the liquid dash 'ot 141, the resulting retardation being sucht at the relatively short impulses are not suflicientlylong to bring thearmature 136 into contact with the terminal 142, while the relativelylong impulses do so. Thus if the impulse through the branch is short itcloses the circuit 54 through its shorter course 88 and does not effectprinting, and ifthe ulse is long that movement is follo'wedby t eclosing of the circuit 54 at 142, and when this happens the currentflows throu h the longer course 54 (actuating the type-w eel) inpreference to the shorter course 88, owing to the resistance 143,inserted in the latter to secure this result, when both courses areclosed. By

of wireless telegraphy may be made to operate the system in the same wayas the positivri and negative impulses of ordinary telegrap 1y.

For convenience of description I have de' scribed the invention asapplied to a simple form of telegraph-receiver, havin an axle bearing asingle type-wheel and printin the characters along a fillet of paper;but do not limit my invention to this particular application, and it maybe applied equal y whether the axle carries one type-wheel or twotype-wheels or a type-cylinder.

I claim 1. A printing-telegraph, comprising rotary adjustableprinting-type, a series of electromechanical devices each giving adifferent throw to said printing-type, a main-line circuit, a series ofselective branch circuits all connected to the main line and eachconnected to and operating its own electromechanical type-movingmechanism, each of said solective branch circuits comprising alocalbattery circuit with two paths, one of which paths passes throughthe electromechanical type-moving device, and anelectrically-differentiating device in each branch circuit acted upon bydifferentiated impulses of the main line, and adapted to throw eachlocal branch circuit through either of its two paths to operate or notoperate the electromechanical type-moving mechanism.

2. A rinting-telegraph, comprising rotary adjustable printing-type, aser.es of electromechanical devices each giving a different throw tosaid printing-type, a main-line circuit, a series of selective branchcircuits all connected to the main line and each connected to andoperating its own electromechanical type-moving mechanism, each of saidselective branch circuits comprising a localbattery circuit with twopaths, one of which paths passes through the electromechanicaltype-moving device, an electrically-differentiating device in eachbranch circuit acted upon by differentiated impulses of the main line,and adapted to throw each local branch circuit through either of its twopaths to operate or not operate the electromechanical type-movingmechanism, a resistance between the main-line branches, an electromagnetlocated in the local circuit of each branch, and a shunting-armatureswitch operated by said last-named electromagnet to cut out thedifferentiating device of one branch and shunt the line to the nextbranch.

3. A rinting-telegraph, comprising rotary adjusta le printing-type, aserles of electromechanical devices, each giving a different throw tosaid printing-type, a main-line circuit, a series of selective branchcircuits, all connected to the main line and each connected to andoperating its own electromechanical type-moving mechanism, each of saidselective branch circuits comprising a localbattery circuit with twopaths, one of which paths passes through the electromechanicaltypemoving device, an electrically-differentlflliin" device in eachbranch circuit acted upon by differentiated impulses of the main lineand adapted to throw each local branch circuit through either of its twopaths to operate or not piperate the electromechanical t e-moving evice,a type-hammer with e ectromagnet and circuit operating the same, acircuit-closing device for the hammer-circuit and an electromagneticdevice arranged in the main line and adapted to operate upon and closethe hammer-circuit at the end of a differentiating movement.

4. A printing-telegraph, com prising rotary adjustable printing-type, aseries of electromechanical devices each giving a different throw tosaid printingtype, a main-line circuit, a series of selective branchcircuits all connected to the main line and each connected to andoperating its own electromechani ical type-moving mechanism, each ofsaid se- 1 lective branch circuits comprising a local- 4 battery circuitwith two paths, one of which paths passes through the electromechanicaltype-moving device, an electrically-differeny tiating ev;ce in eachbranch circuit acted upon by the differentiated impulses of the mainline and adapted to throw each local branch circuit through either ofits two paths to operate or not operate the electromechanir-al type-moving device, a type hammer with electromagnet and circuit operatingthe same, a circuit-closing device for the hamn'ier-circuit, anelectromagnetic device arranged in the main line and adapted to operateupon and close the hammer-circuit at the end of a differentiatingmovement, an armature-switch holding each local branch circuit closed,and an electromagnet for each switch for opening each local branchcircuit, said electromagnet being arranged in a circuit opened by theprinting mechanism.

5. A printing-telegraph, comprising rotary adjustable printing-type, aseries of electromechanical devices each giving a different throw tosaid printing-type, a main-line circuit, a series of selective branchcircuits all connected to the main line and each connee-ted toandoperating its own electromechanical type-moving mechanism, each of saidselective branch circuits comprising a local-battery circuit with twopaths, one of which paths passes through the electromechanicaltype-moving device, an electricallydiflerentiatmg device in each branchcircuit acted upon by the differentiated impulses of the main line andadapted to throw each local branch circuit through either of its twopaths to operate or not operate the electromechanica ty e moving devicea typehammer with eieetromagnet and circuit operating the same, acircuit-closing device for the hammer-circuit, an electroma etic devicearranged in the main line an adapted to operate upon and close thehammer-circuit at the end of a differentiating movement, anarmature-switch holding each local branch circuit closed, and anelectromagnet for each switch for opening each local branch circuit,said electromagnet being arranged in a circuit opened byvthe printingmechanism, a single battery operating both the circuit of theprinting-hammer and the circuit of the opening-magnets of the branchcircuits, and a resistance placed in the latter circuit.

6. The compound selective relay for working a printing-telegraph asdescribed, consistin of main-line branches, local circuits andefectromagnets arranged in groups corresponding to the main-linebranches, whereby the successive impulses of a series of impulses sentalong the main circuit serve to operate the local circuits insuccession, printing mechanism arranged to operate in the intermissionut the close of such impulses, and circuit-opening devices for thegroups operated by the return from the printing stroke, whereby all theparts are returned to their normal positions, ready for the next seriesof impulses.

7. The com bi nation with a series of electron'uignets cech arrangedWork, of it corresponding series of selective branch circuits and :1main-line circuit extending through all of them, each of said selectivebranch circuits having also a, locelto perform a separate l batterycircuit with two paths, one of which pesscs through the saideleetron'iagnet, an l electricellydill'ereutiutingr device in each lbrunch circuit zteted upon by dill'erentieted l l l impulses ol' themain line and elevtromechun- 2o icel shunting devices l1 )1 sending thedill'crentiuted impulses ol each series of impulses transmitted alongthe main-line circuit eonsecutively through the several branch cirleuits in regular succession.

JAlllES DUNDAS W Hllll Witnesses: (l. LEDGER,

ELIZABETH A. KILBr

